CONTENTS. 



Observations and Experiments mi the Mass of Native Iron 

 fdund in Brasil. . . '. . . . , . . 424 



Remarks and Suggestions, for /"art her improving and applying 

 to Use, the Government Trigonometrical Survey of Great 

 Britain 427 



Some Particulars connected with the late Eartliquake in Scot- 

 land. . . . . . . . . . . . . . 43 1 



Remarks on the Article " Strength of Materials " published in 

 Dr. Rees's New Cyclopcediu, vol. xxxvi. part i. . . 433 



On the Fentilation of Coal Mines. . . . . . , 437 



New Theorems applicalle to the Value of Annuities. . . 449 



On Safety-lamps, and the Barrier formed ly JVire-gauze 

 against the Passage of Flame. . . . . . . 451 



Notices respecting New Books. 62, 140, 229, 300, 381, 455 

 Proceedings of Learned Societies. . . 70, 141, 3S3, 457 

 Intelligence and Miscellaneous Articles. 72, 144,230,313,384, 



4(K) 



List of Patents 77, 236, 316, 395 



Meteorological Table 80, 160, 240, 320, 400^ 473 



THE 



